I'm no expert either but this is what we try to do on the Tiger <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />

-Strategy: Before the race or at least some time before the downwind leg think about which side of the course is favorable.
Wind wise, the choices are pretty much limited to left or right and when is the best time to gybe (right after A-mark or nearer to the layline).
Usually if for example the left side is favorable going upwind than that side will also be downwind (<- Does that make any sense?).
Obviously current can also be a factor (closer to shore for less more offshore for more).

-Tactics: Try to keep clean air. Make sure others are not going over the top of you, and try to cover others.
Dont get stuck in dirty air, gybe away if necessary.
Keep an eye on VMG, don't point higher than you have to and move your crew/butt around to fly a little hull when possible.
When approaching the downwind gate think early about which side you want to round it so you hold the best cards for going upwind again.

(Hopefully other will correct me if i'm wrong but I hope this helps).